Competitive interactions in Drosophila melanogaster: recurrent selection for aggression and response

Area of Science:

• Behavioral Genetics
• Animal Behavior
• Evolutionary Biology

Background:

• Understanding the genetic architecture of social behaviors like aggression and response is crucial.
• Drosophila melanogaster serves as a powerful model organism for genetic studies due to its well-characterized genome and rapid generation time.

Purpose of the Study:

• To investigate the genetic basis of aggression and response in a Texas population of Drosophila melanogaster.
• To determine if aggression and response are independently or dependently controlled by genes.

Main Methods:

• Employed recurrent selection programs targeting high response and low aggression.
• Analyzed genetic variation and heritability of aggression and response components in competitive interactions within genetically heterogeneous cultures.
• Estimated realized heritability for low aggression and high response selections.

Main Results:

• The population displayed extensive genetic variation for both aggression and response.
• Recurrent selection effectively modified these traits, with high realized heritability estimates (0.79 for low aggression, 0.74 for high response).
• Rapid changes and plateauing suggest initial major chromosome assortment followed by additive genetic variation.

Conclusions:

• Aggression and response are not entirely independent, indicating a potential shared genetic basis.
• A single set of genes may determine both traits, with some genes having a greater impact on aggression.
• The findings provide insights into the genetic control of social behavior evolution.